Eec Malfunctions; Eec Critical Fault - MD Helicopters MD900 Flight Manual

CSP−902RFM207E−1
Emergency and
Malfunction Procedures
3−5.

EEC MALFUNCTIONS

EEC NON CRITICAL FAULT
CAUTION ANNUNCIATOR
EEC CRITICAL FAULT WARNING
NOTE
: The pilot should attempt to reset the EEC by by slightly moving the affected
engine's twistgrip out of the NORMAL detent, pressing the EEC RESET button,
and returning the twistgrip to NORMAL. Two attempts may be required. If the
EEC malfunction indication clears, the EEC was experiencing a transient fault.
If the EEC malfunction indication remains ON, the fault condition is still present
and the appropriate malfunction procedure shall be followed.

EEC CRITICAL FAULT

NOTE
: In the event that the EEC on one of the engines fails, the fuel flow of that engine
remains fixed and can only be controlled by the twistgrip. The engine with the
serviceable EEC will attempt to maintain N
Indications: EEC with FAIL warning annunciator on and activation of the warning tone
for two cycles.
Procedures:
When necessary, move the affected engine twist grip out of the NORMAL posi­
F
tion to assume manual control of the FMU.
NOTE
: The pilot has the option of leaving the fuel flow fixed or using the throttle twist grip
to adjust the fuel flow (torque). When either twist grip is taken out of the NORMAL
position, the EEC MAN annunciator will illuminate. Changes in power will be
compensated through the serviceable EEC engine from zero torque to
temperature limits. Twist grip movement is only required for large power
changes.
When operating in manual mode (i.e., EEC MAN illuminated),
CAUTION
reductions in power that allow the torque on the engine in the
automatic mode to approach zero % can lead to an increase in
N on the engine being manually controlled into the transient (20
P
second time limit) overspeed range (> 104.5% − third yellow chevron
is
3−8
ROTORCRAFT FLIGHT MANUAL
MD900 (902 Configuration with PW 207E)
( YELLOW)
ANNUNCIATOR (RED)
Figure 3−1. EEC Caution/Warning Annunciators
illuminated).
FAA Approved
Reissue 2
TORQUE
EEC EEC
MAN MAN
FAIL FAIL
EEC MANUAL MODE
ANNUNCIATOR (YELLOW)
/N within limits.
P R
Original
F92−021